What was found
ON DESCENT UPON GEAR EXTENSION AT DSM, THE GEAR HANDLE MOVED TO THE DOWN POSITION, RED INTRANSIT LIGHTS ILLUMINATED BUT NO GEAR EXTENSION. PERFORMED QRH PROCEDURES EXTENDED GEAR USING EMERGENCY GEAR EXTENSION-OBTAINED 3 GREEN LIGHTS WITH NO INTRANSIT LIGHTS, LANDED NORMALLY. MAINTENANCE RESET EMERGENCY GEAR SELECTOR, PRESSURIZED HYDRAULICS AND CHECKED GEAR SELECTOR POSITION BY NIPS INDICATOR. MAINTENANCE REPLACED LANDING GEAR SELECTOR VALVE. OPS CHECK GOOD.